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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '078165d31ff4524fa410e3a9d1930a679677ac0b6042b032be972e2818df2bc1' 
  AND token = 'Ep4KFnsiEPRNQW6a7PSNy8vs3nM+SHLg3SUGa7gQsV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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