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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bc62f1dbe34347fd8a49b4e1e884ed948c978619c67a026367088f5c2cb853f' 
  AND token = '619X25SuZlx5bPb3oqnTrHg9nXvdKXok6Guv6tgTIWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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