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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65e78c3f984342f784b16a35c8064ddbc1fe5f85a7f2b13900a0c9ed7e3358ab' 
  AND token = 'GCf6NKmJc64K+q1Ub0Fi0Jpe46SG6oO2XrEFOrJk0n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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