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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9d280e3e5862f6ede44b3fbfa00fdc0c3534aea225d2220e053eb6a1a7e0e0a' 
  AND token = 'RtrQYcgbPj2XfxoFl/RcYrBzPbpQ/Xi0XqAeksKXvOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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