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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e14328a29a523475b812d81d2444ba8199a1a15eb9b0382b4b4c9fe15c0da41b' 
  AND token = 'QeJj8IkpBe4PLU3ykp9MdPmLU+OMpYZ9V3zeuv0gcJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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