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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14107db3f4282be1083f5b2ec3bac0bed491e8d5a51ff893a67e6d3086c3f755' 
  AND token = 't/TmCwDR+m1drDxBe5l61DWhhKGJ1puVVbVRaINu8nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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