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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e05f8a13c8546a2d2bdb2261ee08c8bef389d4a02472bae5e3c2f8c20c728cf6' 
  AND token = 'KNpM3+x4ub/lPleP75LYeLG+kXu+XOfFKtIhJoTkJmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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