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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '076c73c01bb1f5bab1e3eb48ff836336a9030aba1b89aa932a82de966822bc34' 
  AND token = 'pCs/kzQN3Ep668HZCSKHG/ZS9fctCl6wgfcLxXG2s4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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