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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02fb71eb351bfff06dffd3f192da5dfc85fc59a4d393e4fbddbbbef7a8f02d04' 
  AND token = 'FORJDPsWi7ty1uLQNZviGOVBBi7ypidDRIOoJdt9qKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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