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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abe3a9712515ccca71efa8ea3c50f8b3d6abcbbe9d0ab1af2664a3980b1ab890' 
  AND token = 'K7WdMxI8yBnKikSMrBMXW3FJxSKp1lJ4WeoP8ATtBYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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