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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80a624373f7588dc1c39a822095cbe248a7105fca0f9babfc1bb48b020c322f7' 
  AND token = 'VfNcwqAG+AlFY82Aqh6ftDUkW8+As2yY/jEAeXIRTTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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