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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd1b17833022f14c2b05ab2658d28cbb82d86382e3ba4af53420ec100672881f' 
  AND token = 'jirKb1e9VDkic5z6b0odKG0Ehk40d12yIenzYk+xcaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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