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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28a1d1847d7150dfa9f89b6aac2b5000cb673475d1efc4060077c26c3a0d3ec9' 
  AND token = 'OcgEb/49m+0P2MZV8gS75dL4xtrm/1ER7g477m3FLQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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