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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '830285326671d3ebbe27c39f9c38e4366b1ae1e11a8f305eead64578847f2c57' 
  AND token = '5mHRiGjqtCHnx8tX8V0OIkn06CFXf7bwvAYNRfqwRoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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