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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8f47d4f8e224e4199f6783a3966e6d13f2a750998c55014655f58c84e5b878c' 
  AND token = 'LOpzxUmJPL0cd6a3ZT05oRBjxP7zsgS7yPtV99Xy/Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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