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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7e000c446b0e746636838dd30a1bee8cd52b35d8a2d0761102e44a54bd1f4eb' 
  AND token = 'Tpk/yGkwdSFD7LOJwbBm+20l6H3fUsoda9mqkxQ9pbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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