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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ae0ef739eda491d6a69f81caa6532c7d55e4390ca227707c3e92d4a1449c83b' 
  AND token = '8lmdyHoBLakTFennynRnwVnCc0OZOh/juKvdn7GOXqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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