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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '042f66d4d45efae3893c02dfb1a1185cda4dffc1e2a425b21d130bebd76ec5a7' 
  AND token = 'ZT5leyPQx2yhNL+rC1FLlB2N1UxjYO8Mc44G1ssifzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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