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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '695b03e4cb479f2e1466c3bf187f57fc1f9830a17a0399f39dbba90ca8958b0a' 
  AND token = '1eiS300kvgeIwLxvHRGreNkSPfDrPJGKWgS57w+poNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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