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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22dfcad32ae687f9ae2917d93cd6444c8d4a46381779175e88b411d649e4fa5d' 
  AND token = 'VeS1XjeIP/cxKmLUz0F4imUx+MXLPvM3IiTEP31t5QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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