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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da1aa4fd5a31e74aa0f512b7ca032ab655315a65c1fed6eebb0e4e114dd7aa9' 
  AND token = '0fOr8Rj87tGnSChjyYKH+jtxUo3BGT4aIb0Fk/aUI3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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