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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af814b52760c0e43d2280a992fb8efdea65ed822f588f419b04b2f0a1b4faf61' 
  AND token = 'QzbZESf0xDNOTwt/K7XcGINDjrDADhPwMpHtnwcqEek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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