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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9200f9e178279bbeeb527df66e20d76dcbff43c5ecf5368b265fcb295c084a00' 
  AND token = 'gb35o5k0PZGNrHg1W6t0IF196VWdtXPbOX7KDvfgnW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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