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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc36f2c13649322188d4ff9c880d113fd5b91667ab4f575c5c62b241a2e04c3a' 
  AND token = 'aWoffLMEnckmVFCCqkyq6BxKVVtAyCxHEdN9rCm6cr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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