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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '460e30baa9f3c8cb85f07481c03ea8688113406891a515089075e3a4856c0b98' 
  AND token = 'UJ1d/zv6+64saeBD7qDeLYDn06WJCTni9QKKnDKzr9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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