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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f783953eccde91f621c5a188b1a502629e0a4b5bc6f847e81d5bd951df84393b' 
  AND token = 'N//m7il/d1hC2GjNRypkHdk9NnmVV+2MorrylVYGNXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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