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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19c4f15826397a651771e762aa293587189aab3d39d57dbc690dfa8d2827545e' 
  AND token = '7VuHDRBi/XkZ2k7tsVbndKUax3+ZNsnQ01qDdf4deaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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