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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b73030ee130f2bdbc1da9b29e08fd430efcd96c9f263fb035e674d24764f8c3' 
  AND token = 'TRe0fw2R+RIcDsc0oZ3PR2EqiEA0M0tmyWn2x3tjzPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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