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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e5fed7a2d30b68df0e9d4f456d03ea3e37acb48be95684117b44ecb6cdf60e6' 
  AND token = '1MK3+OK/18ihhN6fwSnfHCbajOnndvtEsSS7TJvfMb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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