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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20cbca6a1702de335fe0abee9a3c6fc88a7f92871c8aeac48edc03c8596374ff' 
  AND token = 'qNfpVkemf9oiSCAStuHx4rfUH70Mfaj01G7xx2J5f1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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