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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0351895683310d1adaa0ff9fe32097c8667e3e6aca8ee8c63c8694a1ada6700f' 
  AND token = 'R7+ZNjk0n76Pmzh+LcZfpezghOKzEcFsxEPJViifvZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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