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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1f004a003a923f5ec9a40fb4cf4e71019c112d836798d5fbf9a0851cacc1a66' 
  AND token = 'o2EYTKQXCwYYz+1o8Fgk2EQlw5TSSyLDbDVf0FT/ktk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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