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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd71e4154788bd2199541398a5658182461923d3d5a0f7283695eb9413d0669f' 
  AND token = 'Ndf+fEfv6Wmy9ZvmSzH/gNQU4Rg+A5IJF1g38ZypSyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00140

JSON explain

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