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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25fdb551a7ba9e74a051dc58fad94a7dc296623470e43dac49b92b2c1c13ab3a' 
  AND token = 'g5sQHMsecGUVGxlfV8dBhu53JykdFuTQyEvGAtROIH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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