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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '851938f7685eb98ae6442cac48ee4142d1381131bc9cd5d720ba2223c6d1c270' 
  AND token = '+IILwQ0Z2HVjoZxKFNgF33escgVxcS0wmtlQrR821JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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