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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd62d21c5741b1c4ca6679c16ad564f82ac6f9d3c96b2258d679f718ab69d072' 
  AND token = 'a2mD87B2lHky/VP9f+fPPvohrylYo8IJHyhWsfklNu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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