SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49b5238049baba87c59b0499b0472a91c2a3d761f902b61e50f3f243cc80243b' 
  AND token = 'AqDQwD/bwxRHFS8XAqZ8d7g3eUjmXPWNTRgDRDdoCzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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