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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fc61c5205d6969b02bc5c4ab347cb9c5802a1e11e3a9848e14cf35499469ac9' 
  AND token = 'j1zKSIh3uw4a+rRp8AgOiu1j/2FvcCXvhKyafL4gUz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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