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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95c06f4b834e7f9c6040814c5e6e3f128c087bcae13a5f0b330aceb6700d274a' 
  AND token = 'ISZoy3CQmHXMGHFSFVas0Ama1/yYRF/bygOKyexyRBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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