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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7e0ab7a771540a029656c5b7677c907c3de692232c254a798266c16bc6d8b72' 
  AND token = 'etU4usLD874KrmtNjBWjHMDcB7tWF8uCqbFSASCBMc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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