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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdd54662b2d2e8aaf7d6e235b51a6b5d130db7f7eec2abb75679d0aad7c44849' 
  AND token = 'f3IqK+EBDGFhL0CWTkj8JCVra54AIvSrNoNcdue3+kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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