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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28d80074a43ba437c62de5df5048e3a173cfcacbfb78d1bf734078f9f40886cb' 
  AND token = '1Uj5J19YKW52mt2j0PvWvq3Mazi3uP/DPNR0rWckdiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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