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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87dbd254bb8c5203c4c6d9b9ed20ede333095b46b046a2a5df81f04ae1f56552' 
  AND token = 'S/ub2g8TSwr9o1DG6nkC+iEfX1c5qVq/8039L2XAT50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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