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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a30b80044933d7ae3e9a1a17a109a12b5cc2378e0d69b340c7c7b54401e8fabd' 
  AND token = 'JbSGYNc3ApZhZgfjcnKlv7mAK8AB3jNKUbv1U2SrCQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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