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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a03ea0aa214785e0df2b8c4c4bfd5c98b0fb91b4ad185c9021d00e2efddce82' 
  AND token = '5kq11RPVa4qcZFROxuUFwAGdz7HsuuceEbaiBg8Q7Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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