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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26d69a8131075a13d9861f04fef020199f3d142f9489728417470956e78a179b' 
  AND token = 'l43rpFP4Z4b2B+rCeSoS3+1GGMLH6sXo+dJtFpp57J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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