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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e332692f4f5f5d0f0d71ab2510a098f0b89a8fb057a1bfbbab43f5d003a9c760' 
  AND token = 'mBk2lfvmHog4XHXrsCruQ87rzki7RW0+PBcg1NaOSe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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