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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0b4c816020a3d4f653245bc6de4417da2a6c11e5d9e134d17f800db0e1a5c5c' 
  AND token = '312mmjhE4SIlOJU8oEh/4c/Aw29N1Ocm/6/aT94Olyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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