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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a195fb58962c2edf099dfc0e756bc06ccb4ae810adcccebc911134ac6b7f9890' 
  AND token = 'q9J4leSpju5IyGcBqM29SjRFBaF0wTC6pRojgiCkpAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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