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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eae0624d2e6e1598c3099812e522dbb34f2a83a464b2edf00f62c089cc6ccd2' 
  AND token = 'swCl7r1Pdw9xCOnmsxZTfV18VU6ElVkDqyJJaFI3xKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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