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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '242f161e312944b93ae8abc9fd4e330b71b73641d90e7918bc817c0174c4e7c7' 
  AND token = '/RyA4Ch+Prk6+VLNixL0Ii/avb3DLS+MEgW4GbsbVis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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