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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dfc0f9ea8adf0ca18080b0a54de2cdf5aeadadc1272c16d27f2c15e2c99fe96' 
  AND token = 'Br9eT/7y0liPGymDK0+mhtr01H+EIIoE5Kj5Lp6akNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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