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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2807dc4b0266ebab698fc28fc93a207fdd7cb9ead4ce167a38d03473af2f1cfe' 
  AND token = 'FOH8CsueuvqBSnf9czC2e30M3rWObLLYL2Y4XPX1380=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}