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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c99b8a50a2110b6e461aff74c67a2878d79dc5dad0fb56df1930941e6926bcd6' 
  AND token = '0nM2v1eCHILNtuITIh79k+mm2wIqAw4jKU6o4aLRHwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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