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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10900d27fd5eb5871ebfca93132944eb27d8f6c26d09963a7acbad87a67c3aaa' 
  AND token = 'qx2Yfi7jhSrXmE412ceOAAqK1lJSBzcBQ6TEQ5vO7a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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